Fixes #6710 - unicode characters in url parameters

Original methods to_param defined on resources called name.parameterize
to get rid of url-unsafe characters. This function unfortunately also
stripped off unicode characters.

Changes:
- parameterization extracted into a separate module Parameterizable
- each resource defines methods 'to_param' and 'from_param' to ensure correct search
- views updated to always use to_param when building links
- parameterization changed to id+name for resources where it wasn't safe to rely only on names
- default parameter is id
fixes #8019 - convert po to JSON before refreshing pot/po files
refs #7587 - pwstrength stylesheet is part of app.css, not standalone
Fixes #7561 - 'No. of CPU' search URL is incorrect
Fixes #8005 - Convert allowed NIC types to strings

- allowed NIC type classes need to be registered now
- api for interfaces use lowercase human readable values for defining types
- fixed output of api's create action to the standard format
fixes #7841 - downgrade OJ gem version to return datetime values in the API as strings and not full JSON objects